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arXiv 1206.6074hep-ex
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用ATLAS探测器在sqrt(s)= 7 TeV的H-> WW ->lnujj衰变通道中寻找希格斯玻色子

Search for the Higgs boson in the H->WW->lnujj decay channel at sqrt(s) = 7 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

在H->WW->lnujj通道中,利用大型强子对撞机上ATLAS探测器在质量中心能量为7 TeV时记录的4.7 fb^-1 pp碰撞数据,对标准模型希格斯玻色子玻色子进行了搜索。与零、一或两个喷流相关联产生的希格斯玻色子候选者被包括在分析中,以最大限度地接受胶子融合和弱玻色子融合希格斯玻色子产生过程。在预期的背景下没有观察到显著的过量事件,并且对于质量在300 GeV < mH < 600 GeV范围内的希格斯玻色子玻色子,推导出了希格斯玻色子玻色子产生截面的限制。最好的灵敏度达到mH = 400 GeV,其中观察到的(预期)95%置信水平上限的横截面为H->WW与零或一个喷流产生的是2.2 pb(1.9 pb),相当于1.9(1.6)倍的标准模型预测。在希格斯玻色子加双喷流通道中,这对弱玻色子融合过程更敏感,在mH = 400 GeV的H->WW产生截面上观察到的(预期的)95%置信水平上限为0.7 pb(0.6 pb),相当于标准模型预测的7.9(6.5)倍。

英文摘要:

A search for the Standard Model Higgs boson has been performed in the H->WW->lnujj channel using 4.7 fb^-1 of pp collision data recorded at a centre-of-mass energy of sqrt(s) = 7 TeV with the ATLAS detector at the Large Hadron Collider. Higgs boson candidates produced in association with zero, one or two jets are included in the analysis to maximize the acceptance for both gluon fusion and weak boson fusion Higgs boson production processes. No significant excess of events is observed over the expected background and limits on the Higgs boson production cross section are derived for a Higgs boson mass in the range 300 GeV < mH < 600 GeV. The best sensitivity is reached for mH = 400 GeV, where the observed (expected) 95% confidence level upper bound on the cross section for H->WW produced in association with zero or one jet is 2.2 pb (1.9 pb), corresponding to 1.9 (1.6) times the Standard Model prediction. In the Higgs boson plus two jets channel, which is more sensitive to the weak boson fusion process, the observed (expected) 95% confidence level upper bound on the cross section for H->WW production with mH = 400 GeV is 0.7 pb (0.6 pb), corresponding to 7.9 (6.5) times the Standard Model prediction.

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